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In page Pickup truck:

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The first fleet-sided pickup truck was the Crosley in the 1940s,[citation needed] followed by the 1955 Chevrolet Cameo Carrier. Early pickups had wood-plank beds, which were largely replaced by steel by the 1960s. In many parts of the world, pickups frequently use a dropside bed – with a flat tray with hinged panels that can be raised separately on the sides and the rear. The fleetside has gradually fully replaced the earlier, separate-fender look: The last time Chevrolet and GMC used the Stepside style was on the 2005 Silverado and Sierra 1500 models; Ford last used the Flareside style on the 2009 F-150.